Thanks for posting your query.
Does he has any history of nasal blockage/ head injury?
Presence of nausea
along with headache and bleeding from nose is an alarming sign and need urgent exploration of disease.
You should consult with internal medicine specialist and ENT surgeon simultaneously and should go for thorough check up.
He should also go for CT/ MRI
scan brain for better clarification.
Bleeding from nose could be stopped after application of nasal packing/ cautery and use of hemostatic medicines.
Hope that helps.
Dr. Mayank Bhargava